The HYCU virtual appliance must limit the number of concurrent sessions to an organization-defined number for each administrator account and/or administrator account type.

Device management includes the ability to control the number of administrators and management sessions that manage a device. Limiting the number of allowed administrators and sessions per administrator based on account type, role, or access type is helpful in limiting risks related to denial-of-service (DoS) attacks. This requirement addresses concurrent sessions for administrative accounts and does not address concurrent sessions by a single administrator via multiple administrative accounts. The maximum number of concurrent sessions should be defined based upon mission needs and the operational environment for each system. At a minimum, limits must be set for SSH, HTTPS, account of last resort, and root account sessions.

In the HYCU Web UI, only one login can be used at a time. If the user is still logged into the HYCU Web UI upon logging in to the Web UI again, in a different browser tab, with the same credentials, this is a finding. Log in to the HYCU VM console. To check the number of allowed concurrent session connections, grep file "/etc/security/limits.conf" by executing the following command: grep maxlogins /etc/security/limits.conf Verify the following line exists: hycu hard maxlogins 1 If the "maxlogins" value is not set to 1 or is missing, this is a finding.

The Web UI will only always allow one user session at a time. For CLI, configure the operating system to limit the max number of concurrent sessions to 1 by adding the following line to "/etc/security/limits.conf": hycu hard maxlogins 1